Greta Jimenez
The burning of fossil fuels has been the primary source of energy for over a century, powering our cars, businesses, and homes. However, the use of fossil fuels has had a devastating impact on the environment and public health. With the planet's average temperature already 1°C higher than pre-industrial levels, the urgency to reduce carbon emissions and limit global warming is undeniable. The fossil fuel sector is the most polluting industry in the world, and the question of which specific fossil fuel is the most polluting has a complex answer. Coal, oil, and natural gas each contribute significantly to emissions, with coal being the most carbon-intensive fossil fuel in terms of emissions per unit of energy produced. However, the extraction and burning of natural gas can also lead to significant environmental damage and greenhouse gas emissions, especially when considering leaks of methane, a potent greenhouse gas. Oil, while not widely used in power generation, is the dominant fuel for transportation, a major polluting sector. To combat climate change, a transition to renewable energy sources is essential.
| Characteristics | Values |
|---|---|
| Fossil fuel that pollutes the most | Coal |
| Percentage of U.S. electricity produced by coal | 44% |
| Percentage of power plant carbon emissions accounted for by coal | 80% |
| Impact of burning coal | Soot, smog, acid rain, global warming, and carbon emissions |
| Other impacts of coal | Waste generation (sludge, toxic chemicals, and heat), air and water pollution, land disturbance, and methane release |
| Percentage of global CO2 emissions from fossil fuels in 2018 | 89% |
| Global air pollution deaths due to fossil fuels in 2018 | Over 8 million |
| Global air pollution deaths due to fossil fuels in 2019 | 10.2 million |
| Global air pollution deaths due to fossil fuels in 2023 | 5.13 million |
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What You'll Learn
Coal is the most polluting fossil fuel
Coal is responsible for over 0.3 degrees Celsius of the 1-degree increase in global average temperatures. This makes it the single largest source of global temperature rise. Burning coal leads to soot, smog, acid rain, global warming, and carbon emissions. It also generates a great deal of waste, including sludge, toxic chemicals, and heat. Coal pollutes during every stage of the energy production process, from mining and transportation to storage and burning. Coal mining methods, particularly mountaintop removal and strip mining, have negative environmental impacts.
Coal is a critical energy source and has been a mainstay in global energy production for centuries. Nearly all of the coal burned in the United States is sub-bituminous or bituminous, and it is found in abundance in states like Kentucky, Pennsylvania, West Virginia, and Wyoming. In 2022, coal accounted for 60% of electricity generation from fossil fuels. Coal produces 44% of US electricity but accounts for 80% of power plant carbon emissions.
The burning of coal also contributes to atmospheric particulate matter, which can cause illness and death when inhaled. The health effects of coal pollution include premature death, acute respiratory illness, aggravated asthma, chronic bronchitis, and decreased lung function. The poor, undernourished, very young, very old, and people with pre-existing respiratory diseases are at the highest risk.
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Oil releases a huge amount of carbon when burned
Fossil fuels are formed from the decomposition of carbon-based organisms that died and were buried millions of years ago. They create carbon-rich deposits that are extracted and burned for energy. There are three types of fossil fuels: coal, oil, and gas.
Burning fossil fuels produces carbon dioxide (CO2) and is the largest driver of global climate change. They are also a major contributor to local air pollution, which is estimated to be linked to millions of premature deaths each year. The Intergovernmental Panel on Climate Change (IPCC) has found that emissions from fossil fuels are the dominant cause of global warming. In 2018, 89% of global CO2 emissions came from fossil fuels and industry.
The amount of CO2 produced when a fuel is burned depends on its carbon content. Coal has the highest carbon content among fossil fuels, making it the most polluting energy source in terms of CO2 emissions and local air pollution. However, oil and gas still produce significant amounts of climate-warming CO2. The heat content or energy produced during combustion is determined by the carbon and hydrogen content of the fuel.
To address the issue of global warming and climate change, the world's governments signed the Paris Agreement in 2015, committing to reducing carbon emissions. While this was a positive step, more needs to be done to transition to renewable energy sources and reduce fossil fuel consumption. Fossil fuel companies remain major polluters, and their products contribute significantly to global carbon emissions.
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Natural gas contributes to global warming emissions
Natural gas is a fossil fuel that is considered cleaner than coal and petroleum products as it produces fewer air pollutants and carbon dioxide (CO2) emissions. However, natural gas still contributes to global warming emissions in several ways. Firstly, burning natural gas releases CO2, a greenhouse gas that is the primary driver of global climate change. While natural gas produces less CO2 per unit of energy compared to other fossil fuels like coal, it still contributes significantly to overall CO2 emissions. In 2022, burning natural gas for energy accounted for about 35% of total US energy-related CO2 emissions.
Secondly, natural gas infrastructure is susceptible to methane leaks, which have a much greater impact on global warming than CO2. Methane is the main component of natural gas, and while it has a shorter lifespan in the atmosphere than CO2, it traps much more heat. The US Environmental Protection Agency estimates that about 6.5 million metric tons of methane leak from the oil and gas supply chain each year, contributing to global warming. These leaks occur during various stages of natural gas production, including extraction, transportation, and storage.
Moreover, the process of extracting natural gas can also contribute to global warming emissions. Techniques like fracking, which involves injecting high-pressure fluids into wells to fracture rock and release gas, have been associated with environmental and health concerns, including air and water pollution. Additionally, the exploration and drilling activities required for natural gas extraction can disturb vegetation, soil, and wildlife habitats, further contributing to emissions and ecological disruption.
Furthermore, when natural gas is flared or burned at well sites, it releases not only CO2 but also other harmful compounds. Flaring natural gas produces carbon monoxide, sulfur dioxide, nitrogen oxides, and other emissions, depending on its chemical composition and burning efficiency. While flaring is considered safer than releasing raw natural gas into the atmosphere, it still contributes to greenhouse gas emissions and local air pollution.
Lastly, the production and consumption of natural gas are closely linked to the broader fossil fuel industry, which has been criticized for its massive carbon emissions and resistance to transitioning towards renewable energy sources. Despite advertising campaigns promoting cleaner natural gas and low-carbon energy, fossil fuel companies, including BP, have been accused of continuing to prioritize investments in oil and gas over renewable alternatives. This industry-wide inertia poses significant challenges to global efforts to mitigate global warming and promote sustainable practices.
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Fossil fuel extraction methods are environmentally detrimental
Fracking, a highly controversial extraction method, involves blasting a mixture of water, chemicals, and sand into rocks at high pressure to release oil or gas. This process generates enormous volumes of wastewater, which is often laden with toxic heavy metals, radioactive materials, and other pollutants. These toxins contaminate drinking water sources, causing severe health issues such as cancer, birth defects, neurological damage, and liver damage. The loud noises, human movement, and vehicle traffic associated with fracking operations also disrupt animal communication, breeding, and nesting patterns, impacting wildlife habitats.
Coal mining, another prevalent extraction method, washes toxic runoff into water bodies and dumps unwanted rock and soil into streams. Coal is the dirtiest fossil fuel, responsible for over 0.3°C of the 1°C increase in global average temperatures. It produces the most carbon dioxide and local air pollution per unit of energy. The burning of coal releases large amounts of carbon, driving the global warming crisis.
Oil extraction is not exempt from environmental concerns. Oil spills during extraction, transportation, or refining can pollute drinking water sources and destroy entire freshwater or ocean ecosystems. Oil combustion emits hazardous air pollutants, including sulfur dioxide, nitrogen oxides, particulate matter, carbon monoxide, and mercury. These pollutants contribute to local air pollution, acid rain, and eutrophication, which lowers oxygen levels in aquatic ecosystems.
The environmental and health impacts of fossil fuel extraction disproportionately affect communities of color and low-income communities. These communities often live in areas with higher pollution levels and face increased health risks, such as the predominantly Black and low-income "Cancer Alley" region in Louisiana.
The infrastructure built for fossil fuel extraction, such as roads, facilities, and drilling sites, can irreversibly damage pristine wilderness areas, removing large swaths of rangelands and vegetation vital for wildlife and humans.
To protect the environment and communities, it is crucial to transition to responsible renewable energy sources, reduce fossil fuel drilling on public lands, and eliminate fossil fuel subsidies. Embracing clean energy alternatives, such as solar and wind power, is essential for preserving the planet and ensuring a sustainable future.
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Burning fossil fuels is the main source of greenhouse gas emissions
Coal, oil, and gas are the three types of fossil fuels, and they have played a dominant role in global energy systems. However, burning these fuels produces carbon dioxide and is the largest driver of global climate change. In 2018, 89% of global CO2 emissions came from fossil fuels and industry, with coal being the most polluting energy source in terms of CO2 emissions and local air pollution. Oil releases a large amount of carbon when burned, contributing approximately one-third of the world's total carbon emissions. Natural gas, which is mostly methane (CH4), has a high hydrogen content, resulting in less CO2 production compared to other fossil fuels for the same amount of energy generated.
The burning of fossil fuels for electricity, heat, and transportation is the largest source of greenhouse gas emissions from human activities in the United States. In 2022, fossil fuel combustion accounted for about 74% of total U.S. human-caused greenhouse gas emissions. The transportation sector is the largest contributor, with over 94% of the fuel used for transportation being petroleum-based, resulting in direct emissions. The commercial and residential sectors also contribute to emissions by burning fossil fuels for heat and using gases for refrigeration and cooling in buildings.
To address the issue of greenhouse gas emissions, a transition to clean and renewable energy sources is necessary. This includes increasing the use of low-carbon energy sources such as nuclear and renewables, as well as investing in fuel-efficient and electric vehicles. Additionally, reducing fossil fuel production, consumption, and pollution is crucial, along with protecting carbon-storing forests and improving waste management practices.
In summary, burning fossil fuels is the primary contributor to greenhouse gas emissions, leading to global warming and climate change. By transitioning to cleaner energy sources and reducing our reliance on fossil fuels, we can mitigate the impact on the planet and human health.
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Frequently asked questions
Coal is the dirtiest fossil fuel. It is the largest contributor to global temperature rise and is the most polluting energy source in terms of the amount of CO2 produced per unit of energy.
Coal contributes to air pollution, particularly atmospheric particulate matter, smog, and acid rain. It also generates waste, including sludge, toxic chemicals, and heat. Additionally, coal mining methods, such as mountaintop removal and strip mining, have negative environmental impacts.
Yes, oil and natural gas are also fossil fuels that contribute to pollution. Oil releases a significant amount of carbon when burned, accounting for approximately one-third of global carbon emissions. Natural gas has lower global warming emissions than coal and oil, but drilling, extracting, and transporting it can lead to methane leakage and land disturbance, which harms ecosystems.
Fossil fuel pollution has significant health impacts. Inhaling particulate matter and other air pollutants from fossil fuel combustion can cause acute respiratory illness, aggravate asthma, lead to chronic bronchitis, and decrease lung function. It is estimated that fossil fuel pollution caused over 8 million global air pollution deaths in 2018 and 10.2 million in 2019.
